The cellular (mobile) frequencies licensed for use in different countries around the world can vary.  Before purchasing a cellular device such as a router or gateway for use outside of New Zealand be sure to check that it supports the frequency of the carrier that it's intended to be used with.


Within New Zealand, the following frequencies are used.  Note that as of 15th of March 2018 2Degrees no longer supports the 2G GSM frequencies.


Operator

Technology

Vodafone
900/1800 MHz GSM (GPRS)
900/2100 MHz UMTS, HSPA, HSPA+, DC-HSPA+
700/1800/2600 MHz LTE
Spark
(formerly Telecom New Zealand)
850/2100 MHz UMTS, HSPA, HSPA+, DC-HSPA+
700/1800/2300/2600 MHz LTE, LTE-A
2degrees
900/2100 MHz UMTS, DC-HSPA+
1800 MHz LTE
Black+White
(using Vodafone)
GSM, GPRS
UMTS, HSPA
Warehouse Mobile[114]
(using 2degrees)
GSM, GPRS
UMTS, HSPA, LTE
Slingshot
(using Spark)
UMTS, HSPA
Skinny
(using Spark)
UMTS, HSPA, LTE
Compass Mobile
(using Spark)[117]
UMTS, HSPA, LTE



Reference resources :

https://en.wikipedia.org/wiki/Mobile_country_code
https://en.wikipedia.org/wiki/List_of_mobile_network_operators_of_the_Asia_Pacific_region#New_Zealand

https://www.frequencycheck.com/countries/new-zealand


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